I recently changed my hdmi cable from a generic 1.3 to an Apple proprietary 1.4, and now my Apple TV will change resolutions on a Panasonic DT30. So clearly the HDMI version is key. Unfortunately at 50hz the flickering is substantially worse. I will try a few changes of options on the menu, such as game mode, turning off all frame creation etc, but for anyone with a Panasonic tv thinking of upgrading their atv if a new one gets released next week I would wait and see if there are any reports about this issue in case it hasn't been addressed.

Sorry to hear that, it has worked for me; just a suggestion but did you try rebooting the atv, or maybe trying a different hdmi input. I have heard that even switching the cable direction round can make a difference...

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